<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>常用指令：v-show</title>
    <script src="js/vue.js"></script>
    <script>
        window.onload=function(){
            let vm=new Vue({
                el:'#itany',
                data:{
                    flag:true
                },
                methods:{
                    change(){
                        this.flag=!this.flag;
                    }
                }
            });
        }
    </script>
</head>
<body>
<div id="itany">
    <!-- <button v-on:click="change">隐藏</button> -->
    <button v-on:click="flag=!flag">隐藏</button>

    <hr>
    <div style="width: 100px;height: 100px; background-color: red" v-if="flag">欢迎来到南京网博</div>
</div>
</body>
</html>